﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace Monitor_Camara
{
    class videoAPI2
    {
        //  视频ＡＰＩ调用
        [DllImport("avicap32.dll")]
        public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
        [DllImport("avicap32.dll")]
        public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);
        //  常量
        public const int WM_USER = 0x400;
        public const int WS_CHILD = 0x40000000;
        public const int WS_VISIBLE = 0x10000000;
        public const int SWP_NOMOVE = 0x2;
        public const int SWP_NOZORDER = 0x4;
        public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10;
        public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;
        public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5;
        public const int WM_CAP_SET_PREVIEW = WM_USER + 50;
        public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;
        public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;
        public const int WM_CAP_START = WM_USER;
        public const int WM_CAP_SAVEDIB = WM_CAP_START + 25;


        //private const int WM_USER = 0x400;
        public const int WM_CAP_START2 = WM_USER;
        public const int WM_CAP_SEQUENCE = WM_CAP_START2 + 62;
        public const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START2 + 20;
        public const int WM_CAP_STOP = 0x000;
    }
        public class cVideo     //视频类
        {
            private IntPtr lwndC;       //保存无符号句柄
            private IntPtr mControlPtr; //保存管理指示器
            private int mWidth;
            private int mHeight;
            public cVideo(IntPtr handle, int width, int height)
            {
                mControlPtr = handle; //显示视频控件的句柄
                mWidth = width;      //视频宽度
                mHeight = height;    //视频高度
            }
            /// <summary>
                    /// 打开视频设备
                    /// </summary>
            public void StartWebCam()
            {
                byte[] lpszName = new byte[100];
                byte[] lpszVer = new byte[100];
                videoAPI2.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
                this.lwndC = videoAPI2.capCreateCaptureWindowA(lpszName, videoAPI2.WS_CHILD | videoAPI2.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);
                if (videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_DRIVER_CONNECT, 0, 0))
                {
                    videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_SET_PREVIEWRATE, 100, 0);
                    videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_SET_PREVIEW, true, 0);
                }
            }
            /// <summary>
                    /// 关闭视频设备
                    /// </summary>
            public void CloseWebcam()
            {
                videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_DRIVER_DISCONNECT, 0, 0);
            }
            ///   <summary>   
                    ///   拍照
                    ///   </summary>   
                    ///   <param   name="path">要保存bmp文件的路径</param>   
            public void GrabImage(IntPtr hWndC, string path)
            {
                IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
                videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
            }

            ///   <summary>   
            ///   开始录像
            ///   </summary>   
            ///   <param   name="path">要保存录像的路径</param>   
            public void StarKinescope(string path)
            {
                IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
                videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32());
                videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_SEQUENCE, 0, 0);
            }
            /// <summary>
            /// 停止录像
            /// </summary>
            public void StopKinescope()
            {
                videoAPI2.SendMessage(lwndC, videoAPI2.WM_CAP_STOP, 0, 0);
            }

    }
    }
